How to do: Seasaw Row

Seesaw row
Stand holding a pair of dumbbells at arm’s length next to your sides. Take a step forward with your left foot, bend your knees, and hinge forward slightly. Row the dumbbell in your right hand to your right side, and then lower it as you row the weight in your left hand to your left side. Continue alternating sides as fast as you can for 20 seconds, and then rest for 10 seconds. Switch legs and repeat.